<template>
    <div>
             <!-- 面包屑导航区 -->
<el-breadcrumb separator-class="el-icon-arrow-right">
  <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
  <el-breadcrumb-item>商品管理</el-breadcrumb-item>
  <el-breadcrumb-item>参数列表</el-breadcrumb-item>
</el-breadcrumb>
<!-- 卡片试图 -->
<el-card>
    <!-- 头部警告区域 -->
    <el-alert
    title="注意：只允许为第三级分类设置相关参数" type="warning" :closable="false">
  </el-alert>
  <!-- 选择商品分类区 -->
  <el-row class="cat_opt">
      <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级链选择框 -->
       <el-cascader expand-trigger="hover"
    v-model="selectedCateKeys"
    :props="cateProps"
    :options="catelist"
    @change="handleChange"></el-cascader>
      </el-col>
  </el-row>
  <!-- tab页签区 -->
  <el-tabs v-model="activeName" @tab-click="handleTabClick">
    <el-tab-pane label="动态参数" name="many">
        <!-- 添加参数按钮 -->
        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
    <!-- 动态参数表格 -->
        <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
                <template slot-scope="scope">
                    <!-- 循环渲染的tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" class="right" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                <!--输入的文本框  -->
                <el-input
  class="input-new-tag"
  v-if="scope.row.inputVisible"
  v-model="scope.row.inputValue"
  ref="saveTagInput"
  size="small"
  @keyup.enter.native="handleInputConfirm(scope.row)"
  @blur="handleInputConfirm(scope.row)"
>
</el-input>
<!-- 添加按钮 -->
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                    <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-tab-pane>
    <el-tab-pane label="静态属性" name="only">
        <!-- 添加属性的按钮 -->
        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
        <!-- 静态属性表格 -->
         <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
                        <!-- 展开行 -->
            <el-table-column type="expand">
                <template slot-scope="scope">
                    <!-- 循环渲染的tag标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" class="right" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                <!--输入的文本框  -->
                <el-input
  class="input-new-tag"
  v-if="scope.row.inputVisible"
  v-model="scope.row.inputValue"
  ref="saveTagInput"
  size="small"
  @keyup.enter.native="handleInputConfirm(scope.row)"
  @blur="handleInputConfirm(scope.row)"
>
</el-input>
<!-- 添加按钮 -->
<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                    <el-button size="mini" type="primary"
                     icon="el-icon-edit"
                      @click="showEditDialog(scope.row.attr_id)">编辑
                      </el-button>
                    <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-tab-pane>
  </el-tabs>
</el-card>
<!-- 添加参数的对话框 -->
<el-dialog
  :title="'添加' + titleText"
  :visible.sync="addDialogVisible"
  width="50%" @close="addDialogClosed">
 <!-- 添加参数的对话框 -->
 <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>
<!-- 修改参数的对话框 -->
<el-dialog
  :title="'修改' + titleText"
  :visible.sync="editDialogVisible"
  width="50%" @close="editDialogClosed">
 <!-- 添加参数的对话框 -->
 <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 商品分类列表
            catelist: [],
            // 级链选择框的配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys: [],
            // 被激活的页签的名称
            activeName: 'many',
            // 动态参数数据
            manyTableData: [],
            // 静态参数数据
            onlyTableData: [],
            // 控制添加对话框的显示与隐藏
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm: {
                attr_name: ''
            },
            // 添加表单的验证规则对象
            addFormRules: {
                attr_name: [{
                    required: true, message: '请输入参数名称', trigger: 'blur'
                }]
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible: false,
            // 修改的表单数据对象
            editForm: {},
            // 修改表单的验证规则对象
            editFormRules: {
                 attr_name: [{
                    required: true, message: '请输入参数名称', trigger: 'blur'
                }]
            }
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有商品分类列表
        async getCateList() {
           const { data: res } = await this.$http.get('categories')
           if (res.meta.status !== 200) {
               return this.$message.error('获取商品分类失败！')
           }
           this.catelist = res.data
        },
        // 级联选择框中选项变化，会触发这个函数
        handleChange() {
      this.getParamsData()
        },
        // tab页签点击事件的处理函数
        handleTabClick() {
            this.getParamsData()
        },
        // 获取参数的列表数据
        async getParamsData() {
                  // 不是3级分类
            if (this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            // 选中的是
            // 根据所选分类的ID和当前所处的面板获取对应的参数
    const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
    params: { sel: this.activeName }
    })
    if (res.meta.status !== 200) {
        return this.$message.error('获取失败')
    }
    res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本矿的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
    })
    if (this.activeName === 'many') {
        this.manyTableData = res.data
    } else {
        this.onlyTableData = res.data
    }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
        this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams() {
        this.$refs.addFormRef.validate(async valid => {
            if (!valid) return
            const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                attr_name: this.addForm.attr_name,
                attr_sel: this.activeName
            })
            if (res.meta.status !== 201) {
                return this.$message.error('添加失败')
            }
            this.$message.success('添加参数成功！')
            this.addDialogVisible = false
            this.getParamsData()
        })
    },
    // 点击按钮 展示修改对话框
    async showEditDialog(attrId) {
        const { data: res } = await this.$http.get(`categories/${this.cateId}
        /attributes/${attrId}`,
        { params: { attr_sel: this.activeName } })
        if (res.meta.status !== 200) {
            return this.$message.error('失败啊')
        }
        this.editDialogVisible = true
        this.editForm = res.data
    },
    editDialogClosed() {
        this.$refs.editFormRef.resetFields()
    },
    // 点击按钮，修改参数信息
    editParams() {
        this.$refs.editFormRef.validate(async valid => {
            if (!valid) return
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
            { attr_name: this.editForm.attr_name,
             attr_sel:
            this.activeName
            })
            if (res.meta.status !== 200) {
                return this.$message.error('修改参数失败!')
            }
            this.$message.success('修改参数成功')
            this.getParamsData()
            this.editDialogVisible = false
        })
    },
    // 根据ID删除对应的参数项
    async removeParams(attrId) {
        const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        if (confirmResult !== 'confirm') {
            return this.$message.info('已经删除')
        }
        // 执行删除业务逻辑
       const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
       if (res.meta.status !== 200) {
           return this.$message.error('删除参数失败')
       }
       this.$message.success('删除成功')
    //    刷新列表
    this.getParamsData()
    },
    // 文本框失去交单
    async handleInputConfirm(row) {
        if (row.inputValue.trim().length === 0) {
            row.inputVisible = false
            row.inputValue = ''
            return
        }
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        // 发起请求保存这次操作
       this.saveAttrVals(row)
    },
    async saveAttrVals(row) {
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
            attr_name: row.attr_name,
            attr_sel: row.attr_sel,
            attr_vals: row.attr_vals.join(' ')
        })
        if (res.meta.status !== 200) {
            return this.$message.error('失败')
        }
        this.$message.success('Ok')
    },
    showInput(row) {
        row.inputVisible = true
        // 自动获取焦点
         this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus()
        })
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
        row.attr_vals.splice(i, 1)
        this.saveAttrVals()
    }
    },
    // 计算属性
    computed: {
        // 如果按钮需要被禁用则返回true，否则返回flase
        isBtnDisabled() {
            if (this.selectedCateKeys.length !== 3) {
                return true
            }
            return false
        },
        // 当前选中的三级分类的ID
        cateId() {
            if (this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText() {
            if (this.activeName === 'many') {
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt {
    margin: 15px;
}
.right{
    margin-right: 15px;
}
.input-new-tag {
    width: 120px;
}
</style>